Map of the oil district of West Virginia

Although West Virginia is the second state in the country for coal production, crude oil has also been drilled for since the mid-19th century. This map, produced during the Civil War, shows the "oil district" of West Virginia, and includes locations of oil and gas wells, as well as coal seams. The map has a note stating "first oil found 1790," in a location just north of present-day Elizabeth in Wirt County.
Courtesy of Boston Public Library